Making sense of loading confusion, I think is helped (Ralph or Lewm, feel free to chime in/correct me) by understanding that the resistor is going from signal to ground. The higher the resistor value, the less "shorting" of the circuit there is. So higher resistance values mean less loading though it is easy-if you don't understand circuits (I raise my hand) to assume that higher resistance means higher loading.
MM Phono Input impedance change 47k to 100k ohms
The well-written AudiogoNer Raul states that the Grace F9 Ruby MM cartridge is best matched with an input impedance of 100k ohms vs the standard 47k ohms. May be a dumb question, but is this a simple resistor swap that I might be able to handle or should I best take the preamp to a technician?